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 Atomic No. Order:
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 Alphabetic Order:
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  Periodic Table

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  2, 8, 18,  

  5  

 

 

  N
 7 		  P
15 		  As
33 		Sb
51 		  Bi
 83 		Uup
115 		Uhp
165 		Bup
215

Arsenic

Symbol As
Atomic Number 33
Relative Atomic Mass
12C = 12.0000 		74.921 60 (±2) [Since 1995]
Atomic Radius pm 121
First Ionisation Energy
kJ mol -1 		947.0
Ionisation Energy (eV)  9.7886
Electronegativity 2.18
Density
kg m -3 		5780 (±)
4700 (²) [293 K]
Molar Volume
cm 3 		12.95 (±)
15.9 (²)
Thermal Conductivity
W m -1 K -1 		50.0 (±) [300 K]
Melting Point K 1090 (±, under pressure)
Boiling Point  K 889 (sublimes)
Number of Isotopes 22
Isotope Atomic mass/u Mole fraction 75As 74.921 5966(18) 1.0000
Inner + outer Shells
  3   +   1    = 4
Inner + outer Orbitals
  28   +   5    = 33
Filling Orbital
  4p 3   
Ground State Electron
Configuration
[Ar]  3d 10    4s 2    4p 3       
Ground State Electron
Configuration with
free Orbitals (n=3)

 

  0, 0, 0, 3  

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Ground State Electron
Configuration with
compressed Orbitals (n=24)

 

  0, 0, 0, 24  

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Singularity
60 =  28 + 5 + 3 + 24
 
 
s
p
d
 f
g
h
i
j
1
2
             
2
2
6
           
3
2
6
10
         
4
2
3
3 10

14

       
5
               
6
               
7
               
  
Term Symbol 4S 3/2
Discovery The German scientist and philosopher, Albert von Bollstadt [1193 - 1280] (Albert the Great/ Albertus Magnus ) is thought to have obtained the metal around 1250.
 
Name Derived From The name derives from the Latin arsenicium and the Greek arsenikos for "masculine or male" because the ancients thought that metals were different sexes. It was known in prehistoric times for its poisonous sulfides. Greek arsenikon meaning 'yellow orpiment'
 

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